class A {
    constructor(name, age){
        this.name = name;
        this.age = age;
    }
}
class B extends A {
    constructor(name, age, addr) {
        super(name, age);
        this.addr = addr;
    }
}

module.exports = B;

// function createA(){
//     return new B("zhangsan", 24, "sichuan")
// }

// createA();

